Large-volume metrology measurements are conducted at every major phase of alignment and integration of the Integrated Science Instrument Module (ISIM), which forms the main payload of the James Webb Space Telescope (JWST) at NASA Goddard Space Flight Center (GSFC). Both ambient and cryogenic metrology measurements are used to verify that ISIM and ground support equipment (GSE) conform to the predicted position and orientation at various integration and alignment states.

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